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Be aware how your voice works. Have you ever pulled the open end of an air filled balloon tight and the air rushes out at a squeal like pitch, then the more you open the balloon, the quieter and lower the pitch gets. This is a literal representation of your vocal chords.
Medical Definition of Vocal cord paralysis Vocal cord paralysis: Inability of one or both vocal folds (vocal cords) to move. The paralysis is usually due to damage to the nerves going to the vocal cords or due to damage to the brain itself. In more technical terms, vocal cord paralysis may result from lesions in the nucleus ambiguus or its supranuclear tracts in the brain, the main trunk of the vagus nerve, or the recurrent laryngeal nerves (which supply the larynx.